brick
It could be a bipyramid.
One word that rhymes with "cup" and starts with "B" is "blup."
Bourbon.
A compound word that starts with shape could be shape up.
a square starts with 's'
Birthday party is one.
One example of a medicine that starts with "B" is ibuprofen, which is a common over-the-counter pain reliever and anti-inflammatory drug.
A square
Bear starts with the letter B
ArcArchimedean solidAntiprismacute triangleacute trianglearcacute triangleAn arc of a circle is one exampleAn arc is a shape. An acute triangle is a shape.
Easy One, Bangkok
Belgium is a country that starts with B.